#container {
    text-align: center;
    margin: 0 auto;
    display: flex;
    align-items: center;
    flex-direction: column;
}

.light-btn {
    align-items: center;
    padding: 0 20px;
    margin-top: 25px;
    font-size: 20px;
    background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
    background-size: 400%;
    width: 200px;
    height: 50px;
    line-height: 50px;
    color: #fff;
    text-align: center;
    text-transform: uppercase;
    border-radius: 50px;
    z-index: 1;
    border: none;
    outline: none;
}

.light-btn:hover::before,
.light-btn:hover {
    animation: sun 8s infinite;
}

.light-btn::before {
    content: '';
    left: -5px;
    right: -5px;
    top: -5px;
    bottom: -5px;
    background: linear-gradient(90deg, #03a9f4, #f441a5, #ffeb3b, #03a9f4);
    background-size: 400%;
    border-radius: 50px;
    filter: blur(10px);
    z-index: -1;
}

@keyframes sun {
    100% {
        background-position: -400% 0;
    }
}
